汶川8.0级地震前后地壳垂直形变分析
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摘要
利用汶川8.0级地震周边区域水准、跨断裂水准资料,分析了汶川Ms8.0地震前后的地壳垂直形变。结果表明:震前,区域垂直形变表现出某种阶段性,升降差异运动由剧烈向减弱变化,龙门山断裂活动也由活跃向闭锁转换;震后,地震影响主要沿龙门山断裂带向北东方向扩展,余震区附近同震形变显著。
Using regional leveling and fault-crossing leveling data the crustal vertical deformation has been analyzed before and after Wenchuan Ms8.0 earthquake.The results show that before the earthquake the regional deformation were staged,in detail,its differential elevation and subsidence weakened and the movement of Longmenshan fault turned from active to locked,after the earthquake,the earthquake effect spreaded north-east ward along the Longmenshan fault mainly and the co-seismic deformation nearby the after shock region was obvious.
Using regional leveling and fault-crossing leveling data the crustal vertical deformation has been analyzed before and after Wenchuan Ms8.0 earthquake.The results show that before the earthquake the regional deformation were staged,in detail,its differential elevation and subsidence weakened and the movement of Longmenshan fault turned from active to locked,after the earthquake,the earthquake effect spreaded north-east ward along the Longmenshan fault mainly and the co-seismic deformation nearby the after shock region was obvious.
引文
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